| 摘要 |
<p>PURPOSE:To realize a desired optical separation factor distribution in the optical separated surface, by separating a plane area containing a relief type structure body, into plural areas, and constituting the reflection surface for forming a separated light beam, of a microdot pattern. CONSTITUTION:An area 40 on which a reflection film is provided like a micropattern is separated into three areas, the areas are separated into three zones named A, B and C zones from the center, and the reflection film is provided in the form of a microround pattern so that the diameter and density are same in the respective same zones, and both of them are different in the differnt zones, and a reflection factor of the reflection film of each zone A, B and C is all equal. Since a lot of parts having a reflecton film and having no reflection film cover an object to be photographed, the same phtometric weighting as has changed a reflection factor is attained effectively. In this way, a desired optical separation factor distribution is realized in the optical separated surface.</p> |
